In September of 1950, two Soviet fighter planes, while in flight in the sky over [the] Sea of Japan, tried to attack a UFO. The incident was observed by crew of a Japanese merchant vessel. One of the planes, having spent all of its ammunition without any results, approached the UFO to a dangerously close distance. But the aircraft began vibrating unexpectedly, and broke apart into small fragments as a result of interacting with the object’s protective field. This brief report was published [in] the Russian digest, published in 1998 (Okkul’tniye sili SSSR, Saint Petersburg).